Method of making stud fastener members.



.A. 1. LEWIS.

METHOD OF MAKING STUD FASTENER MEMBERS.

APPLICATION FILED FEB. I9. 1918.

lfi slu Patented Dec. 31,1918.

ARTHUR J. LEWIS, or STRATFORD, CONNECTICUT.-

METHOD OF MAKING STUD FASTENER MEMBERS.

ma a e Specification of Letters latent.

Patented Dec. 31, 1918.

Application filed February 19. 1918. Serial No. 21 8.013.

To all whom it may concern:

Be it known that I, ARTHUR J. LEWIS, a citizen of the United States, residing at Stratford, county of Fairfield, State of Connecticut, have invented an Improvement in Methods of Making Stud Fastener Members, of which the following is a specification.

This invention has for its object to provide a novel method of making stud fastener members provided with a round solid rim or edge, from sheet metal. A further object of the invention is the production of a better stud fastener member than has heretofore been known and at a greatly decreased cost of manufacture.

With these and other objects in view I have devised the novel member and method of production which I will now describe referring to the accompanying drawing forming a part of this specification, and using reference characters to indicate the several parts.

Figures 1, 2, 3, 4 and 5 are sectional views on a greatly enlarged scale illustrating successive steps in my novel method of manu facturing stud members, and F Fig. 6 is a plan view corresponding with 10 denotes the strip or sheet of metal fromwhich the fastener members are blanked out and formed. The operations are all performed by punches and dies suitably designed to produce the desired result, and not illustrated as they are not of the essence of the present invention. The first operation, the effect of which is illustrated in Fig. 1, consists in forming a central stud, indicated by 11. The stud may or may not be formed in such away as to reduce the thickness of the metal. Ordinarily, however, the metal of the stud will be somewhat thinner than the surrounding metal from which the attaching plate 12 and rim or edge 13 are formed.

The second operation is a stamping operation and the result is illustrated in Fig. 52. Themetal of the strip or plate is forced outward radially from the base of the stud to form the inner half of the rim, which is rounded in cross section, and circular channels or depressions 14 are formed on opposite sides of the strip or plate by forcing the metal inward radially to form the outer half of the rounded rim which is,

. is greatly enlarged.

however, left attached to the plate by a web 15.

It will of course be understoodthat in all of the views the thickness of the metal The third operation, as illustrated in Fig. 3, is the piercing of the thread holes 16. This operation of piercing is preferably performed at this stage of the manufacture, but may be performed later as will be explained. The result of the piercing op-. eration is clearly illustrated in Fig. 6. An important feature of the thread holes is that they are of greatest length at the points of intersection of the attaching plate with the rim, so that there are no sharp edged webs left to cut the thread, as in all fastener. members heretofore produced, so far as I am aware, the entire thread carrying portion of the wall of each hole being the rim itself which is solid and smoothly rounded, as is clearly shown in Figs. 4 and 5.

The fourth operation, Fig. 4, is the separation of the fastener member from the strip or sheet.

The. fifth operation, the result of which is illustrated in Fig. 5, is the necking operation, and consists in closing in the metal at the base of the stud circumferentially to form the neck 17, which completes the formation of the member. The operation of necking may if preferred be performed before the partly formed member is detached from the strip or plate, that is, it may be performed after either the first, second or third operation. It is preferably, however, performed after the fourth operation, as shown. It is likewise not essential that the piercing operation be performed before the partly formed fastener member is detached from the strip or sheet, as it is quite practicable to perform this operation' after the member, either partly or wholly formed, has been detached from the strip or sheet, as after either the fourthor fifth operation.

Having thus described my invention I claim:

1. The method of forming stud fastener members from sheet metal, which consists in forming a central stud, forcing metal outward radially from the base of the stud and other metal inward radially to form an attaching plate surrounding the stud and a rounded rim surrounding the plate, piercas illustrated in' ing thread holes in the plate contiguous to the rim, separating the member from the sheet of metal, and necking by closing in the base of the stud cireumferentially.

2. The method of forming stud fastener members from sheet metal, which consists in forming a central stud, forcing metal outward radially from the base of the stud and other metal inward radially to form an attaching plate surrounding the stud and a rounded rim surrounding the plate, separating the member from the sheet of metal, and necking by closing in the base of the stud circumferentially.

3. The method of forming stud fastener members from sheet metal, which consists in forming a central stud, forcing metal,

outward radially from, the base of the stud and other metal inward radially to form an attaching plate surrounding the stud and a rounded rim surrounding the plate, piercing thread holes in the plate contiguous to the rim, and separating the member from the sheet of metal. a

4:. The method of forming stud fastener members from sheet metal, which consists in forming a central stud, forcing metal outward radially from the base of the stud to form an attaching plate and the inner half of a rounded rim surrounding the plate, and forcing metal inward radially to form the outer half of the rounded rim.

In testimony whereof I aiiix my signature.

I ARTHUR J. LEWIS. 

